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Unidentifiable references (U1-U27)

See also Catalogue Raisonné of the Unidentified References (UA1-UA50)

In this list, taken from Welsh/Joosten 1998, there are 27 works of art by Piet Mondrian made from the second half of 1911 onwards that cannot be identified or identified with certainty. These works are indicated with the letter U followed by a number. Joosten found the artwork references in various sources, including exhibition catalogues and letters from Mondrian dating from 1922, 1927 and 1928. Joosten named a possible candidate for half of the unidentified references. This is noted in RKDexplore as ‘possibly identifiable as’ with a link to the artwork concerned 1 [For example https://rkd.nl/explore/images/277266].